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Electrically conductive thermosetting resins containing low concentrations of carbon black
Author(s) -
Narkis M.,
Rafail I.,
Victor G.,
Tzur A.,
Tchoudakov R.,
Siegmann A.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000516)76:7<1165::aid-app20>3.0.co;2-#
Subject(s) - thermosetting polymer , carbon black , materials science , electrical conductor , polymer science , composite material , carbon fibers , polymer chemistry , composite number , natural rubber
A cured vinyl ester resin containing electrically conductive carbon black (CB) particles shows electrical percolation at very low CB concentration (<0.5 phr). CB particles have a strong tendency to agglomerate in a low‐viscosity resin, such as vinyl ester, unsaturated polyester resin, and epoxy resins. The agglomeration process in the low‐viscosity vinyl ester resin generates electrically conductive paths already in the resin's liquid state, which undergo partial fixation by room temperature curing and full fixation by hot postcuring. The fully cured castings containing CB concentrations above percolation are characterized by a constant, temperature‐independent conductivity, over a wide temperature range. The current–voltage relationships of the cured vinyl ester/CB castings obey a power‐law dependency. The presence of the continuous CB paths in the vinyl ester casting is clearly observed in fracture surfaces formed at 100°C. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1165–1170, 2000